| 0,0 → 1,29 |
|---|
| /* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */ |
| #include <unistd.h> |
| #include <errno.h> |
| |
| /* The references disagree on the values of these. Higher value |
| means less important process. */ |
| #define NICE_MIN -20 |
| #define NICE_MAX +20 |
| #define NICE_USER 0 |
| |
| static int nice_val = NICE_USER; |
| |
| int nice (int incr) |
| { |
| if (incr < 0 && getuid () != 0) { |
| errno = EPERM; |
| return -1; |
| } |
| |
| nice_val += incr; |
| if (nice_val < NICE_MIN) nice_val = NICE_MIN; |
| if (nice_val > NICE_MAX) nice_val = NICE_MAX; |
| |
| /* This is braindead by design! If -1 returned you don't know |
| if you had an error! Luckily you can ignore errors for a |
| function like this. */ |
| errno = 0; |
| return (nice_val - NICE_USER); |
| } |